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公开(公告)号：US20210250099A1
公开(公告)日：2021-08-12
申请号：US17135593
申请日：2020-12-28
Applicant: Fujitsu Optical Components Limited
Inventor： Tetsuji YAMABANA , Tsuyoshi MORISHITA
IPC: H04B10/50 , H04B10/564 , H04B10/556
Abstract: Controller and control method are provided. In particular, a controller is disclosed as being configured to hold intensities of a monitor signal, which changes according to an output from a region in a device, before and after altering a state of a portion in the region and control the state of the portion based on a difference between the held intensities.
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